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Black powder belongs to a class of explosives called deflagrating or low explosives. ... Low explosives react so slowly that they will not produce an explosion unless confined. It is the sudden liberation of gases due to the bursting of the container which produces the effects of the explosion.
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What the city doesn't know won't hurt them.
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You should never have more than 1 lb. of black powder in your house. The real problem comes if, for whatever reason your house should catch fire and burn to the ground and the Fire Marshall should find that an excessive amount of powder (above local or state regulations), black or smokeless contributed to the severity of the fire there is a good chance your insurance company is going to deny your claim. If you live in a multi family building (Townhouse) you could be sued for the damage to the other units.
Just not worth the risk IMHO.
Dave
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Containment in the total containment sphere made it go high order. echo154 is right on. The explosive potential in one gallon of gasoline exceeds dozens & dozens of powder, by far.
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A web search brings up a multitude of videos about what happens when quantities of energetic materials are ignited either loosely or confined.
Including Black Powder and some of the substitutes.
It seems to be a very popular "What if?" question.